THUNDER BAY – Weather – The CLE is still weeks away, but for this weekend, get set to ride a weather rollercoaster.
Thunder Bay is waking up to a cool and cloudy morning, but conditions are about to shift dramatically. A surge of warm, humid air will push temperatures into the high 20s, with a humidex nearing 37°C.
Combined with a 70% chance of afternoon showers and a risk of thunderstorms, residents should prepare for sudden weather changes today and into Saturday.
Today’s Weather Overview
Current Conditions
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Temperature: 11.3°C
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Humidity: 96%
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Wind: Light from the NNW at 3 km/h
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Pressure: 101.4 kPa (falling)
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Conditions: Mostly Cloudy
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Visibility: 32 km
Forecast Details
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High: 28°C
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Humidex: 37 – Very humid
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Wind: Becoming southwest 20 km/h, gusting to 40 by noon
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Rain/Storms: 30% chance of showers early, rising to 70% by afternoon. Risk of thunderstorms late this morning and afternoon
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UV Index: 6 – High
Tomorrow’s Forecast
Expected Conditions – Saturday, July 5
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Morning: Cloudy with a 70% chance of showers and continued thunderstorm risk
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High: 23°C | Humidex: 25 – much more comfortable
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Winds: Variable, gusting early then easing
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Night: Cloudy periods with a 30% chance of showers, low of 14°C
Wardrobe Recommendations
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Today: Dress in light, breathable clothing but carry rain gear or an umbrella for passing storms.
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Footwear: Waterproof shoes are recommended for those on foot during the afternoon.
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Saturday: A light jacket or sweater will be handy in the cooler morning, especially if showers persist.
Health & Safety Tips
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Heat and Humidity: Although the day starts cool, the humidex will rise quickly. Stay hydrated and avoid prolonged activity outdoors during peak afternoon hours.
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Storm Precautions: Be alert for lightning, heavy downpours, and gusty winds—especially around midday through evening.
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Fog Advisory: Fog patches may reduce visibility late tonight. Use caution while driving or cycling after dark.
Weather Trivia
Did you know? Thunder Bay once saw a humidex of 42°C during a freak July heatwave in 2012—one of the highest ever recorded in the city. Today’s projected humidex of 37°C is unseasonably high for the region and should not be underestimated.
